why #include<dos.h> is not working in C language in this app ?

Question

ccode

Answer 1

Dos.h in C: Dos.h header file of C language contains functions for handling interrupts, producing sound, date and time functions etc. It is Borland specific and works in Turbo C compiler.

Answer 2

It only works in turbo c compiler

Answer 3

I guess Sololearn compiler is different

Answer 4

But solo learn is compiler of all languages😯😯😯. Then why is not working ?

Answer 5

why